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Texas Instruments ADS774JP
- Part No.:
- ADS774JP
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
ADS774JP.pdf
- Description:
- IC ADC 12BIT SAR 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,082
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Product details
Overview
ADS774JP from Burr-Brown Corporation is a 12-bit successive approximation analog-to-digital converter (ADC) with integrated sampling, internal +2.5V reference, microprocessor-compatible parallel interface, and single +5V supply operation. It delivers 8.5µs max conversion time over temperature, supports ±10V/±5V/0–10V/0–20V input ranges, and eliminates external sample/hold in most data acquisition systems for industrial instrumentation.
For engineers reviewing the ADS774JP datasheet, ADS774JP pinout, ADS774JP application, or ADS774JP equivalent, this page provides verified technical context, real-world timing behavior, confirmed DC/AC accuracy specs, package-specific thermal resistance (100°C/W), and drop-in replacement guidance versus legacy ADC574/ADC674/ADC774 designs.
Technical Context
The ADS774JP implements charge-redistribution successive approximation using a laser-trimmed capacitor array (CDAC) in low-power CMOS, enabling full 12-bit conversion without external clock or reference. Its dual-mode operation-S/H Control Mode (aperture jitter ≤300ps rms) and ADC774 Emulation Mode (1.6µs aperture delay)-supports both new high-speed designs and legacy socket replacements.
Internal scaling resistors configure input ranges (±10V, ±5V, 0–10V, 0–20V); three-state parallel outputs (DB0–DB11, STATUS) interface directly to 8- or 12-bit buses; and control logic accepts TTL/CMOS-compatible CE, CS, R/C, AO, and 12/8 inputs for flexible 8-/12-bit conversion initiation and data readout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees monotonic transfer function with no missing codes across full temperature range. |
| Conversion Time | 8.5 µs max (TMIN to TMAX) - enables 117 kHz sustained sampling rate without pipeline or latency penalties. |
| Input Ranges | ±10 V, ±5 V, 0 to +10 V, 0 to +20 V - selectable via external resistor networks; LSB = 4.88 mV (±10 V range). |
| DC Accuracy | ±1 LSB linearity error, ±4 LSB unipolar offset error (TMIN to TMAX) - supports calibrated sensor signal chains without post-conversion correction. |
| AC Performance | 68 dB SINAD (±10 V, 20 kHz input), 73 dB SFDR - meets requirements for medium-bandwidth industrial control loop feedback. |
| Supply | +5 V only required (VEE optional) - simplifies power design; 120 mW max power dissipation at full temperature range. |
| Reference | +2.5 V internal (±0.1 V tolerance), 0.5 mA source capability - eliminates external reference IC in space-constrained systems. |
Pinout & Package
ADS774JP is housed in a 28-pin 0.6" wide plastic DIP package (Package Drawing #215), with θJA = 100°C/W. Pin 7 is NC (not internally connected); pins 13 and 14 are mutually exclusive range selects; analog and digital commons (pins 9 and 15) must be joined externally at the device.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive Supply | +5 V main supply; only voltage required for operation. |
| 5 (R/C) | Read/Convert Control | Falling edge initiates conversion; rising edge enables data read in stand-alone mode. |
| 6 (CE) | Chip Enable | Active-high enable for conversion start or data output access; latches A0 state. |
| 11 (VEE) | Mode Select Input | Logic level determines S/H Control Mode (+5 V) or ADC774 Emulation Mode (–15 V). |
| 13 (10V Range) | Unipolar Range Select | Connect to analog common for 0–10 V or ±5 V input; leave open for 20 V range. |
| 14 (20V Range) | Unipolar Range Select | Connect to analog common for 0–20 V or ±10 V input; leave open for 10 V range. |
| 16–27 (DB0–DB11) | Parallel Data Output | Three-state, MSB-first binary outputs; DB0 = LSB, DB11 = MSB; format depends on 12/8 and AO states. |
| 28 (STATUS) | Conversion Status Flag | High during conversion; falls after data is latched - used as ready signal for synchronous read timing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Sample/Hold | Eliminates external S/H amplifier in >90% of industrial DAQ applications due to 1.4 µs full-scale settling and sub-ns aperture jitter in Control Mode. |
| Single +5 V Operation | Removes need for ±15 V supplies - reduces BOM count, PCB area, and EMI from dual-rail regulators. |
| Dual Interface Modes | ADC774 Emulation Mode enables plug-in replacement in legacy sockets; S/H Control Mode enables higher throughput and simplified timing. |
| Laser-Trimmed Scaling Resistors | Enables precise 0–10 V, 0–20 V, ±5 V, ±10 V input ranges without external gain/offset components or calibration per unit. |
| Microprocessor-Compatible Outputs | Three-state DB0–DB11 and STATUS support direct connection to 8-bit or 12-bit buses with configurable 8/12-bit read cycles. |
Applications
| Industrial Process Monitoring | Programmable Logic Controller (PLC) Analog Input Modules |
|---|---|
|
Use Scenario: Continuous voltage monitoring of pressure transducers, RTD bridges, and 4–20 mA loop receivers in factory automation cabinets. IC Role / Device Role / Timing Role: Primary 12-bit ADC capturing sensor outputs at 100+ kHz with deterministic 8.5 µs latency and ±1 LSB linearity over 0°C to +70°C. Use Value: Enables single-chip analog front-end for multi-channel modules without external S/H or reference, reducing component count by ≥3 per channel. |
Use Scenario: High-density I/O cards acquiring analog signals from distributed field sensors in modular PLC backplanes. IC Role / Device Role / Timing Role: Parallel-output ADC interfacing directly to 8-bit microcontroller data bus via AO/12/8 control; STATUS synchronizes read timing. Use Value: Supports left-justified 8-bit byte reads (MSB first, then LSB+zeros), allowing seamless integration into legacy 8-bit firmware without bus-width upgrades. |
| Test & Measurement Equipment | Motor Drive Current Sensing |
|
Use Scenario: Medium-speed digitization in portable DMMs and benchtop oscilloscope auxiliary channels requiring <1% total error. IC Role / Device Role / Timing Role: Precision ADC with internal +2.5 V reference and ±10 V bipolar input handling AC-coupled sensor signals with offset calibration. Use Value: Delivers 68 dB SINAD at 20 kHz input - sufficient for 6½-digit DMM resolution and harmonic analysis up to 5th order. |
Use Scenario: Real-time phase current sampling in 3-phase inverter drives operating at 10–20 kHz PWM frequencies. IC Role / Device Role / Timing Role: Fast-acquisition ADC in S/H Control Mode (300 ps rms jitter) capturing current shunt voltages with minimal aliasing. Use Value: Enables accurate torque estimation and overcurrent protection with <1 µs effective aperture uncertainty - critical for field-oriented control stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit parallel-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS774KP | Same architecture and pinout; ±1/2 LSB linearity error (vs ±1 LSB for ADS774JP) and 70 dB SINAD (vs 68 dB). | Preferred where tighter DC accuracy and improved AC performance are required in same 0.6" DIP footprint. | Select ADS774KP when system-level calibration budget is constrained and higher SNR is needed for noise-sensitive measurements. |
| ADS774JU | Identical electrical specs but in 28-lead SOIC package (θJA = 100°C/W); same 0°C to +70°C temp range and ±1 LSB linearity. | Suitable for space-constrained PCBs where DIP sockets are not used and reflow assembly is preferred. | Choose ADS774JU for modern surface-mount production; verify thermal pad layout matches SOIC thermal resistance requirements. |
Compared with ADS774KP and ADS774JU, the ADS774JP offers the lowest-cost 0.6" DIP solution for legacy-compatible industrial DAQ designs where ±1 LSB linearity and 68 dB SINAD meet system requirements and through-hole assembly is standard.
Availability
ADS774JP is available at Aetrix Electronics and suitable for industrial process monitoring, programmable logic controller (PLC) analog input modules, test & measurement equipment, and motor drive current sensing requiring stable component supply and long-term obsolescence management.
Supply support for ADS774JP includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Burr-Brown Corporation was a U.S.-based analog semiconductor pioneer, acquired by Texas Instruments in 2000, known for precision data converters, op-amps, and interface ICs.
The ADS774JP belongs to Burr-Brown's mid-speed, high-accuracy parallel-output ADC family designed specifically for industrial data acquisition systems requiring integrated sampling, single-supply operation, and drop-in compatibility with legacy ADC774-based hardware.
FAQ
What is the maximum sampling rate supported by the ADS774JP?
The ADS774JP achieves a maximum sustained sampling rate of 117 kHz over its full operating temperature range (0°C to +70°C). This is derived from its guaranteed 8.5 µs max conversion time including acquisition, and is validated under conditions of fIN = 10 kHz and sampling frequency = 117 kHz per the official datasheet. The ADS774JP maintains this rate without pipeline latency or missing codes.
Does the ADS774JP require an external reference voltage?
No, the ADS774JP does not require an external reference voltage. It integrates a +2.5 V internal reference (±0.1 V tolerance at +25°C) with 0.5 mA source capability, sufficient to drive external calibration circuitry. The REF OUT (pin 8) and REF IN (pin 10) pins allow optional external trimming but are fully functional with internal reference enabled.
Can the ADS774JP replace an ADC774 in an existing design without board changes?
Yes, the ADS774JP operates in ADC774 Emulation Mode when VEE (pin 11) is connected to –15 V, matching the timing, pinout, and interface behavior of the ADC774. It requires no PCB modifications and retains compatibility with existing software and socket layouts - confirmed in the datasheet as a drop-in replacement for ADC574, ADC674, and ADC774 models.
What are the power supply requirements for the ADS774JP?
The ADS774JP requires only a single +5 V supply (VDD, pin 1) for full operation. VEE (pin 11) is optional and serves only as a logic-level mode select input (–15 V for Emulation Mode, +5 V for S/H Control Mode). No +15 V or –5 V supplies are needed. Total power dissipation is 75–120 mW depending on VEE configuration and temperature.
How is the input range selected on the ADS774JP?
Input range selection on the ADS774JP is performed externally using pins 13 (10V Range) and 14 (20V Range). For ±10 V or 0–20 V operation, connect pin 14 to analog common and leave pin 13 open. For ±5 V or 0–10 V operation, connect pin 13 to analog common and leave pin 14 open. These connections route the analog input through internal laser-trimmed scaling resistors to match the CDAC's full-scale range.
ADS774JP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 125k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V, -16.5V ~ 5.5
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
ADS774JP FAQ
1.How can I place an order for ADS774JP through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS774JP on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS774JP reliable?
The price and inventory of ADS774JP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS774JP is usually 5 days.
3.What payment methods are accepted for ADS774JP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS774JP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS774JP?
ADS774JP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS774JP order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS774JP?
For technical support, including ADS774JP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS774JP requirements.
6.How does Aetrix verify that ADS774JP is sourced from the original manufacturer or authorized distributors?
All ADS774JP products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS774JP meets industry standards.
7.What is the process for return or replacement of ADS774JP?
All ADS774JP units undergo pre-shipment inspection (PSI). If there is an issue with ADS774JP, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS774JP part is unused and in its original packaging.
Return procedure for ADS774JP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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